How to Handle This Break Up

Asking for a friend, Yes. Seriously. I was dead against this girl btw but he wants opinion of reddit. Here's a situation, M36, madly in love, wife has a past, trauma with her ex, a son from ex, an abortion, married for last 5 years with my friend, together for 8. Wife's previous marriage lasted on paper for around 8 years, in person for couple of years, she had one confirmed boyfriend in between, didn't workout, he ran away from the wedding. She met my friend, they fell in love, dated for few years and got married. No kids as she can't conceive anymore. Since marriage she is having some or the other medical issues, started with High BP (2020), Knee Replacement (2021), Depression (2021), Hip Bone Isse (2022), Bariatric Surgery Cosmetic (2023), Total Hip Replacement Righ (2024), Left Hip Replacement (2025), Left Knew Replacement Planned (2026). All paid by either husbands insurance or savings. Husband is busy in care giver duty mostly and treated as a thankless person. In between the rehabs she feels better he takes her out shopping and vacation to make her feel better which ends up in draining the savings further. In short the guy is poor every year after earning a substantial amount. 2nd major issue is she talks a lot about her 2nd boyfriend which is ofcourse not accepted by the husband. 3rd issue is her son, there are some unresolved issues with her ex husband related to the son's parenting and now she wants her current husband to take the ownership of her son from the 1st marriage e.g. college fees, shopping expenses etc. Current husband has already made it clear to her and her mother that if he knew her son was coming back into the picture he wouldn't have Even dated her. She wants her husband to fund iphone, imac etc for her son so that her ex husband can also enjoy I suppose. These issues along with her daily screaming has caused so much of trauma to the husband that he is nuts now. Her mother spoke to the husband and requested his to fund one more surgery and wait for 2 months for her daughter to recover before ending the relationship. What do you guys suggest, how should he cope up during this time?